Design Parameters and Commissioning of Vertical Inserts Used for Testing the XFEL Superconducting Cavities

TL;DR

This paper discusses the design and commissioning of vertical inserts used for testing superconducting cavities in the European XFEL, enabling efficient cooling and RF measurement of multiple cavities simultaneously.

Contribution

It introduces the design parameters and commissioning process of vertical inserts for testing multiple superconducting cavities in the XFEL facility.

Findings

Vertical inserts allow testing of 4 cavities simultaneously.

The design reduces testing time by enabling parallel cooling.

RF measurements are performed individually for quality assurance.

Abstract

The European XFEL is a new research facility currently under construction at DESY in the Hamburg area in Germany. From 2015 on, it will generate extremely intense X-ray flashes that will be used by researchers from all over the world. The superconducting XFEL linear accelerator consists of 100 accelerator modules with more than 800 RF-cavities inside. The accelerator modules, superconducting magnets and cavities will be tested in the accelerator module test facility (AMTF). This paper gives an overview of the design parameters and the commissioning of the vertical insert, used in two cryostats (XATC) of the AMTF-hall. The Insert serves as a holder for 4 nine-cell cavities. This gives the possibility to cool down 4 cavities to 2K in parallel and, consequently, to reduce the testing time. The following RF measurement, selected as quality check, will be done separately for each cavity. Afterwards the cavities will be warmed up again and will be sent to the accelerator module assembly.